Theme: "BE QUIET" (36A: "Shh!" (and a hint to the feature shared by the answers to starred clues) — each long theme answer features a word with a silent "B"
OK, The "BE QUIET" part is cute, but simply having a silent "B" somewhere in the answer hardly constitutes a theme, especially when there is nothing else holding the answers together. The "B" appears in the first word two times, in the last two the other two times. Your theme is So loose that you could have at least made the placement consistent, or maybe made the vowel sound consistent, but no. Just ... silent "B." Meh.
- 20A: *Shari Lewis puppet (LAMB Chop)
- 11D: *Duster's find at a crime scene (THUMB print)
- 28D: *Precariously situated (out on a LIMB)
- 52A: *Act all innocent (play DUMB)
- 45A: Jeff Gordon was its 1993 Rookie of the Year (NASCAR) — did realize he'd been around so long. He is the current Sprint Cup leader. I know this *only* because I am typing this while sitting on the couch with SportCenter on the TV right in front of me. I'm watching for the baseball news - Opening Day!
- 48A: Sold for a big profit, as tickets (scalped) — I thought this was reselling them a. illegally, and b. for Any amount over face value.
- 57A: Soft-tipped pen brand (Flair) — haven't seen that clue before. The brand name is familiar, I don't use "soft-tipped" pens.
- 22D: Paw's mate? (maw) — I don't get this. I get that Pa is Ma's mate, but ... is this just a terrible pun? Is there a phrase that unites PAW and MAW that I'm unaware of. Maybe a variation on "living hand to mouth" - "living PAW to MAW?"
- 26D: Mont Blanc's range (Alps) — another pen clue (unwittingly). Mont Blanc is also the name of a beloved robot who's murdered in the opening pages of the awesome, ongoing manga epic "Pluto" (a 21st-century reboot of Osamu Tezuka's "Astro Boy")
- 44D: Annoying people (noodges) — man that is one ugly word. Never used it.
- 53D: Bear among the stars (Ursa) — Perhaps the most common astronomical answer. Also a common bear answer. A bear in four letters is URSA. Or YOGI, I guess.
Everything Else — 1A: Narrow-necked pear (BOSC); 5A: James who robbed trains (JESSE); 10A: Wine glass part (STEM); 14A: Pasty-faced (ASHY); 15A: Laud, as virtues (EXTOL); 16A: Drive-__ window (THRU); 17A: "Pow!" relative (WHAM); 18A: Immune system agent (TCELL); 19A: Litter's littlest (RUNT); 20A: *Shari Lewis puppet (LAMBCHOP); 22A: '50s first lady (MAMIE); 23A: 50-and-over org. (AARP); 24A: Open-bodied truck (FLATBED); 26A: Moon mission name (APOLLO); 29A: Photo enlargement (BLOWUP); 30A: No-goodnik (LOUSE); 31A: Really punch (SLUG); 32A: Hosp. scanners (MRIS); 35A: Extinguish, with "out" (PUT); 36A: "Shh!" (and a hint to the feature shared by the answers to starred clues) (BEQUIET); 39A: Legal Lance (ITO); 40A: __ away: hide on a ship (STOW); 42A: Hit, in billiards (CUED); 43A: Paquin and Nicole Smith (ANNAS); 45A: Jeff Gordon was its 1993 Rookie of the Year (NASCAR); 47A: Cavern (GROTTO); 48A: Sold for a big profit, as tickets (SCALPED); 50A: Gucci of fashion (ALDO); 51A: Brit's boob tube (TELLY); 52A: *Act all innocent (PLAYDUMB); 56A: Miscellany (OLIO); 57A: Soft-tipped pen brand (FLAIR); 59A: Civil War color (GRAY); 60A: Dole's 1996 running mate (KEMP); 61A: Give up (WAIVE); 62A: This, in Tegucigalpa (ESTO); 63A: Draws away from shore (EBBS); 64A: Force units (DYNES); 65A: Swedish auto (SAAB); 1D: Cry loudly (BAWL); 2D: On-the-job protection org. (OSHA); 3D: Pillow covering (SHAM); 4D: Drummer's crashers (CYMBALS); 5D: Rockers __ Tull (JETHRO); 6D: Many a security guard (EXCOP); 7D: One of AA's twelve (STEP); 8D: Sun, in Spain (SOL); 9D: Building addition (ELL); 10D: Layer (STRATUM); 11D: *Duster's find at a crime scene (THUMBPRINT); 12D: Tennessee-born country singer Ford (ERNIE); 13D: Like a subdued trumpet (MUTED); 21D: Biblical spy (CALEB); 22D: Paw's mate? (MAW); 24D: Transmission stuff (FLUID); 25D: Opera box (LOGE); 26D: Mont Blanc's range (ALPS); 27D: Protruded-lip expression (POUT); 28D: *Precariously situated (OUTONALIMB); 29D: More azure (BLUER); 31D: Cheerleading unit (SQUAD); 33D: "Let's leave __ that" (ITAT); 34D: Mediocre (SOSO); 37D: Pilate's "Behold!" (ECCE); 38D: Late (TARDY); 41D: Trounces (WALLOPS); 44D: Annoying people (NOODGES); 46D: James Bond, e.g. (SPY); 47D: Piercing looks (GLARES); 48D: Stir the fire (STOKE); 49D: Paparazzi target (CELEB); 50D: __ and kicking (ALIVE); 52D: It can be chronic or shooting (PAIN); 53D: Bear among the stars (URSA); 54D: __ Hari (MATA); 55D: "We're not serving liquor," briefly (BYOB); 57D: Bk. introduction (FWD); 58D: Make, as a wager (LAY).